留着那些工具；它们可能哪天会派上用场。

Keep those tools; they might ___come ___in ___handy someday.

有个备用房间在客人来访时会很有用。

Having a spare room can ___come ___in ___handy when guests visit.

这个多功能工具在你露营时会派上用场。

This multi-tool will ___come ___in ___handy during your camping trip.